SAIB NM-07-11

FAA Aircraft Certification Service SPECIAL AIRWORTHINESS INFORMATION BULLETIN http://www.faa.gov/aircraft/safety/alerts/SAIB

SAIB : NM-07-11 Date: November 24, 2006 This is information only. Recommendations aren’t mandatory.

Introduction

This Special Airworthiness Information Bulletin advises you, owners and operators of Bombardier Inc. Models CL 600-2B19 (CRJ-100/200/440); CL 600-2C10, -2D15 and -2D24 (CRJ-700/705/900) airplanes, that operators have reported cracking of the Brake System Accumulators, part number 08-60163- 002 which could result in separation of the end cap with subsequent loss pf pressure of the affected system and possible damage to the surrounding systems and structure . Bombardier is undertaking an engineering investigation to address the root causes of this issue.

Table 1 Model Service Letter No. CL 600-2B19 CRJ100/200-SL-32-043, dated May 18, 2006 CL 600-2C10, -2D15, -2D24 CRJ 700/705/900-SL-32- 037, dated May 19, 2006

Background

Bombardier has issued Service Letters (SLs) listed in table 1, to recommend visual inspection of the brake accumulators to detect possible cracking of a hydraulic braking system accumulator screw cap. Bombardier issued the SLs to mitigate the risk of an event and to obtain additional data for the investigation.

Recommendation

We strongly recommend that you implement the contents of Bombardier’s SLs listed in table one. We have determined that an AD is not warranted at this time.

For Further Information, Contact

Dan Parrillo, Aerospace Engineer, FAA NYACO, ANE-172, 1600 Stewart Ave, Suite 410, Westbury, N.Y. 11590; phone: (516) 228-7305; fax: (516) 794-5531; email: [email protected]

For Service Letter Information, Contact

Bombardier Inc. 400, Cote-Vertu West Dorval, Quebec H4S 1Y9 Phone: (514) 855-8500 Fax: (514) 855-8501 Website: racs.bombardier.com